Study on Preparation Technique of SiC/Cu-Al Composite by Pressureless Infiltration
In order to improve the compatibility between SiC particles and aluminum, the SiC/Cu composite powders were prepared by using chemical plating method to coat a Cu layer on the SiC particles surface. The obtained powders were made into preform and then put it into molten aluminium. SiC/Cu-Al composite were produced by using pressureless infiltration method under argon gas. By scanning electron microscopy (SEM), optical microscopy (OM), X-ray diffraction (XRD),the phase structure and microstructure of SiC/Cu composite powders and SiC/Cu-Al composite were analysed. Moreover, the temperature and soaking time on the effect of SiC/Cu-Al composite infiltration depth and effect were studied. The results show that: Cu coating on the SiC particles surface distributed uniformly; SiC/Cu-Al composite prepared at the condition of 800°C and 2 hours soaking time has a densification microstructure, SiC particles uniformly distributed in the aluminum matrix and there is no Al4C3 brittle phase formation; at 700°C～900°C infiltration, as the temperature growing, infiltration depth increases at first and then decreases; the microstructure of SiC/Cu-Al composite which infiltrated 2 hours is more compact than that 1 hour; Cu coating effectively improved the wettability between SiC particles and molten aluminum, and inhibited the formation of harmful interfacial reaction.
Jianmin Zeng, Taosen Li, Shaojian Ma, Zhengyi Jiang and Daoguo Yang
S. M. Du et al., "Study on Preparation Technique of SiC/Cu-Al Composite by Pressureless Infiltration", Advanced Materials Research, Vols. 194-196, pp. 1869-1875, 2011